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T3/Cytomel is the thyroid hormone... responsible for basic metabolism.
Clenebuterol is a beta-2 angonist....
Mess with t3 at your level of knowledge, and you could end up with a permanently shut down thyroid. Mess with Clen at your level and you could end up in the hospital twisted up like a pretzel from the muscle cramps and other issues....
Be safe, make sure you know what you are doing. BigAndy has a thread on here somewhere that is an awesome Clen FAQ....